S
M
T
W
T
F
S
26
66°
56°
27
67°
57°
28
71°
54°
29
71°
55°
30
70°
58°
1
76°
58°
2
76°
59°
3
71°
57°
4
70°
53°
5
70°
55°
6
75°
57°
7
80°
60°
8
81°
61°
9
79°
58°
10
76°
61°
11
77°
59°
12
76°
60°
13
79°
61°
14
75°
58°
15
69°
54°
16
70°
55°
17
70°
55°
18
71°
54°
19
70°
55°
20
70°
55°
21
77°
59°
22
78°
62°
23
78°
61°
24
77°
60°
25
78°
61°
26
78°
61°
27
77°
59°
28
75°
58°
29
75°
56°
30
71°
57°
31
71°
56°
1
72°
56°
2
74°
58°
3
76°
60°
4
78°
60°
5
76°
61°
6
75°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Tustin
Tustin's May 2026 forecast shows daily high temperatures ranging from 69° to 81°, with overnight lows between 53° and 62°. The average high for May is 75° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Tustin. See also: June | July | August.
